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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2011 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.reflect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.Beta;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.lang.reflect.Type;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.lang.reflect.TypeVariable;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>import javax.annotation.Nullable;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>/**<a name="line.29"></a>
<span class="sourceLineNo">030</span> * Captures a free type variable that can be used in {@link TypeToken#where}.<a name="line.30"></a>
<span class="sourceLineNo">031</span> * For example: &lt;pre&gt;   {@code<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> *   static &lt;T&gt; TypeToken&lt;List&lt;T&gt;&gt; listOf(Class&lt;T&gt; elementType) {<a name="line.33"></a>
<span class="sourceLineNo">034</span> *     return new TypeToken&lt;List&lt;T&gt;&gt;() {}<a name="line.34"></a>
<span class="sourceLineNo">035</span> *         .where(new TypeParameter&lt;T&gt;() {}, elementType);<a name="line.35"></a>
<span class="sourceLineNo">036</span> *   }<a name="line.36"></a>
<span class="sourceLineNo">037</span> * }&lt;/pre&gt;<a name="line.37"></a>
<span class="sourceLineNo">038</span> *<a name="line.38"></a>
<span class="sourceLineNo">039</span> * @author Ben Yu<a name="line.39"></a>
<span class="sourceLineNo">040</span> * @since 12.0<a name="line.40"></a>
<span class="sourceLineNo">041</span> */<a name="line.41"></a>
<span class="sourceLineNo">042</span>@Beta<a name="line.42"></a>
<span class="sourceLineNo">043</span>public abstract class TypeParameter&lt;T&gt; extends TypeCapture&lt;T&gt; {<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>  final TypeVariable&lt;?&gt; typeVariable;<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>  private TypeParameter(TypeVariable&lt;?&gt; typeVariable) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>    this.typeVariable = checkNotNull(typeVariable);<a name="line.48"></a>
<span class="sourceLineNo">049</span>  }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>  protected TypeParameter() {<a name="line.51"></a>
<span class="sourceLineNo">052</span>    Type type = capture();<a name="line.52"></a>
<span class="sourceLineNo">053</span>    checkArgument(type instanceof TypeVariable, "%s should be a type variable.", type);<a name="line.53"></a>
<span class="sourceLineNo">054</span>    this.typeVariable = (TypeVariable&lt;?&gt;) type;<a name="line.54"></a>
<span class="sourceLineNo">055</span>  }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>  @Override public final int hashCode() {<a name="line.57"></a>
<span class="sourceLineNo">058</span>    return typeVariable.hashCode();<a name="line.58"></a>
<span class="sourceLineNo">059</span>  }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>  @Override public final boolean equals(@Nullable Object o) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>    if (o instanceof TypeParameter) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>      TypeParameter&lt;?&gt; that = (TypeParameter&lt;?&gt;) o;<a name="line.63"></a>
<span class="sourceLineNo">064</span>      return typeVariable.equals(that.typeVariable);<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span>    return false;<a name="line.66"></a>
<span class="sourceLineNo">067</span>  }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>  @Override public String toString() {<a name="line.69"></a>
<span class="sourceLineNo">070</span>    return typeVariable.toString();<a name="line.70"></a>
<span class="sourceLineNo">071</span>  }<a name="line.71"></a>
<span class="sourceLineNo">072</span>}<a name="line.72"></a>




























































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